#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;

  struct TreeNode 
  {
      int val;
      struct TreeNode *left;
      struct TreeNode *right;
  };
bool isSameTree(struct TreeNode* p, struct TreeNode* q)
{
    if (p == NULL && q == NULL)
        return true;
    if (p == NULL && q != NULL)
        return false;
    if (p != NULL && q == NULL)
        return false;
    if (p->val != q->val)
        return false;
    return isSameTree(p->left, q->left) && isSameTree(p->right, q->right);
}